Andrew Mayflower wrote:Better is relative and depends on the totality of circumstances.
Can a tractor be designed to do what you want? Yes, but the bigger question is if you can then build it, and affordably so. I'm skeptical that you could do that as a backyard project, especially if it's going to be durable enough.
When I have meat chickens I use the poultry netting with a shelter for overnight. The shelter gets moved at least once daily, and the electric net gets moved at least weekly. Meat birds don't need (or use in many cases even if available) much in the way of roost bars, so their shelter can be pretty simple. Hens are different, so if this an egg laying operation you'll need nest boxes and proper roosts in a coop for them for overnight.
Main thing though is that a net fence will give them a MUCH larger area than any tractor. So if giving them that space is important (and/or necessary) you might find you need to go that route. But, if you can be out there to move the tractor 1-2 times a day that might be a good alternative.
It is getting really hard where we live to find a thick gauge chicken wire. All our new building is being down with 1/2 inch "hardware cloth" as it gives better predator protection and is less prone to damage.
I'm envisioning a nest/roost coop that has a chicken wire area that could somehow be put on drawer tracks to telescope out giving them a small pen area that would be secure